Medicine is a subject which is closely related to patients' health. Any error made by the doctor can be a threat to patients' life

so the administrative department of the hospital and medical special-ties conclude a set of principles and rules to ensure that the doctor can treat the patient correctly. By fol-lowing the principles and rules

physicians can not only improve the quality of treatment

but also protect themselves from litigation. Generally speaking

physicians should abide principles and rules and procedures for patients

the public and themselves. In another perspective

rules have limitations and they are usually lagged behind the development of the society and technology. In many cases

doctors need to make decisions by their own judgment without rules to follow.